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Answer the following questions. 

A. Four children with four different blood groups are born to parents where the mother has blood group ‘A’ and the father has blood group ‘B’. Work out the cross to show the genotypes of the parents and all four children.

B. Explain the contribution of Alfred Sturtevant in ‘Chromosome mapping’.

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A.

B. Alfred Sturtevant used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes and mapped their position on the chromosome

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